05-17-2019, 10:27 AM | #1 |
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Rough/shaky start up
I have f30 335i 3015
Vrsf charge pipe Vrsf intercooler Vrsf downpipe Stage 2 bootmod3 Ngk spark plugs Liquid moly oil Recently I been having roughy and very shaky start ups in the morning car almost pretty much turn off then had to restarted it
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05-17-2019, 11:06 AM | #2 |
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I know with bm3.it allows you to take logs, but does it also allow real time monitoring? if not take a log during your rough idle and use that to diagnose it.
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05-17-2019, 11:11 AM | #3 |
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How can I log it
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05-17-2019, 11:13 AM | #4 |
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one of the guys with bm3 are going to have to answer that, or you can try youtube or if their is a manual/help section within the software. I myself use mhd to flash/log so not sure about bootmode.
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05-17-2019, 11:14 AM | #5 | |
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05-17-2019, 11:20 AM | #6 | ||
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MG F30 M-Sport 6mt FBO w/ MHD stage 2 plus (PWG), ST XA Coilovers, 19" VMR V804.
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05-17-2019, 11:23 AM | #7 |
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My car does the same, similar setup with new OEM plugs, but it has only done this a few times and has otherwise had smooth starts.
curious what is the cause for this, as well as the slight knocking for only the first few minutes of idle (injectors?).
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05-17-2019, 11:24 AM | #8 | |||
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05-17-2019, 11:25 AM | #9 |
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Yea my car just started doing it only has done it twice so far I have cold star delete too because I have muffler delete and both resonators deleted
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05-17-2019, 11:46 AM | #10 |
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@Supremegee, rough start up like the RPM goes below 700 almost turning off then the car recovers within 10 seconds and then idles high for about 20 seconds then normalizes? I have the same setups but not vrsf brands. I figured it could be due to my plug being gapped at .022. What is yours set at?
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05-17-2019, 11:59 AM | #11 | |
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05-17-2019, 12:01 PM | #12 | |
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05-18-2019, 11:34 PM | #13 |
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new coils fixed this issue in my car.
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05-19-2019, 01:30 AM | #14 |
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Start up bm3 on your phone or laptop. Then before you start the engine Click on date logs and start the log. You should let it start with the data going. Then stop the data logging after the rough idle.
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05-19-2019, 11:21 PM | #15 |
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What are these coils you speak of sir? My car is still shaking like a freightliner in first gear every time I turn it on.
No matter time of day, temperatures, humidity, hot or cold start you name it. Thing just shakes and Shakes.
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05-20-2019, 06:17 AM | #16 |
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Check codes and start by cleaning your MAF sensor with some CRC MAF Sensor Cleaner.
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05-20-2019, 09:07 PM | #17 |
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i first tried to eliminate the problem buying new spark plugs. it was better but not gone. i have bm3 and sent in the logs. tuners said to replace your ignition coils. i also before getting ignition coils did as the above post stated. i removed my maf and gave it a bath, twice with maf cleaner. rough idle still pursued. i finally bought new bosch ignition coils and fixed the issue.
people on forums will say log before throwing money at things. i agree. so i went through the neccessary steps before dropping 200 on 6 ignition coils. but that was in fact why i was having a rough idle. ignition coils go above your sparkplug and send electricity to them to create ignition. after 74k miles and how hot our engines run one of or more than one of mine were faulty. they were also causing a hesitation in wot. which is now fixed too. i bought the bosch set for the n55 off www.bmwsparkplugs.com they have an article of what maintence you should do before tuning your car. one of those things is change ignition coils! hope this helps! |
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05-20-2019, 10:09 PM | #18 | |
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05-20-2019, 10:10 PM | #19 | |
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05-20-2019, 10:12 PM | #20 | |
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05-20-2019, 10:14 PM | #21 | ||
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05-20-2019, 10:17 PM | #22 | ||
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